The running shoe has evolved over the past century from a simple sneaker into a sophisticated performance shoe. It has undergone developments in technology focused on safety, effectiveness, and protecting the foot and body from impacts. Running shoes are designed for different foot strike patterns - neutral, pronation, or supination - and surfaces. Innovations aim to maximize friction between the shoe and ground to prevent slipping through flat or spiked designs depending on the terrain.

1. Running shoe
• In the sports world, athletic equipment are
always researching for new advances in
technology an physiology to improte the
effectiveness of their products, as well as the
safety of the athlete using them, Just like the
running shoe…

2. The development
• In only a few decades, the running shoe has changed
from a simple sneaker to a sophisticated aerodynamic,
foot-protecting performance necessity.
• It has development in facts like the placement and
alignment of the body, as well as the foot itself, and the
increasing of choreographic demands, such as different
movements from the foot inside the shoe.
• Innovation of technology, safety and aesthetic
perfection has been developed for years so the
effectiveness of the running shoe is higher.

3. 3 stages of the running shoe
• Neutral: This is where the heel of the runner makes contact
with the ground and the foot travels in a straight line as it
moves forward.
• Pronation: This where the heel hits the ground but this time
the foot moves to the side as it travels forward. It refers to the
inward roll of the foot.
• Supenation: This is where the heel hits the ground and the
foot rolls outward.

4. Types of shoes..
• Friction between the surface and bottom of
the shoes is important if the runner wants to
go anywhere.
• For surfaces like sidewalks, roads, and rocky
areas the bottom of running shoes should be
flat as there would be enough friction
between the shoe and ground for not slipping.
• The bottom of the shoe should also be flat
because the surface area contact is larger.

5. What happens when you slip?
• Slipping results in thermal energy instead of
going towards movement as the following
equation implies:
• W = F*d*cosθ
where W is
work F is the
force
θ is the angle between F and d

6. Also in grassy
situations..
• Concerning to friction, the bottom of a running shoe
may be flat for a track surface or spiked for a grassy
surface.
• The point here is to keep the shoe from slipping on the
ground. Energy = force x distance, so if your foot slips,
you've lost energy through that distance of slipping.
• A spiked shoe is good for the grass because once the
spike drives into the ground, there are not only
frictional forces involved but also normal forces
between the spike's surface and the dirt pushing
against the spikes.

7. • Normal forces tend to be a lot more
effective than frictional forces in stopping
movement.
• Since the friction coefficient of the
material inside is not changing, the
higher normal force will cause an
increase in the maximum static friction
force and will help keep the foot from
slipping.

8. Running shoe development…
1900

10. 1930

11. 1950

12. 1980

13. 2000

14. 2014